TwitterMap
Neat.
TwitterMap "pulls the location and last message of Twitter community members using a public Twitter feed, then plots it to a Google Map. The resulting map lets you discover what geographic area your Twitter friends are from, or you can find new Twitter-folk to interact with in your community." (via)
This is fun to look at. I tried it and it works very well.
Funny how twittermap judges your approximate locationn & then default zooms to your area of the country. So far, stevencohen and BillDrew have not required the map being scrolled across. Howdy, locals!